ghc-mod/Language/Haskell/GhcMod/Cradle.hs

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module Language.Haskell.GhcMod.Cradle (
findCradle
, findCradle'
, findSpecCradle
, cleanupCradle
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) where
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import Language.Haskell.GhcMod.PathsAndFiles
import Language.Haskell.GhcMod.Monad.Types
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Utils
import Control.Applicative
import Control.Monad
import Control.Monad.Trans.Maybe
import Data.Maybe
import System.Directory
import System.FilePath
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import Prelude
----------------------------------------------------------------
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-- | Finding 'Cradle'.
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-- Find a cabal file by tracing ancestor directories.
-- Find a sandbox according to a cabal sandbox config
-- in a cabal directory.
findCradle :: IO Cradle
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findCradle = findCradle' =<< getCurrentDirectory
findCradle' :: FilePath -> IO Cradle
findCradle' dir = run $ do
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(customCradle dir `mplus` cabalCradle dir `mplus` sandboxCradle dir `mplus` plainCradle dir)
where run a = fillTempDir =<< (fromJust <$> runMaybeT a)
findSpecCradle :: FilePath -> IO Cradle
findSpecCradle dir = do
let cfs = [cabalCradle, sandboxCradle]
cs <- catMaybes <$> mapM (runMaybeT . ($ dir)) cfs
gcs <- filterM isNotGmCradle cs
fillTempDir =<< case gcs of
[] -> fromJust <$> runMaybeT (plainCradle dir)
c:_ -> return c
where
isNotGmCradle :: Cradle -> IO Bool
isNotGmCradle crdl = do
not <$> doesFileExist (cradleRootDir crdl </> "ghc-mod.cabal")
cleanupCradle :: Cradle -> IO ()
cleanupCradle crdl = removeDirectoryRecursive $ cradleTempDir crdl
fillTempDir :: MonadIO m => Cradle -> m Cradle
fillTempDir crdl = do
tmpDir <- liftIO $ newTempDir (cradleRootDir crdl)
return crdl { cradleTempDir = tmpDir }
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customCradle :: FilePath -> MaybeT IO Cradle
customCradle wdir = do
cabalFile <- MaybeT $ findCabalFile wdir
let cabalDir = takeDirectory cabalFile
return Cradle {
cradleCurrentDir = wdir
, cradleRootDir = cabalDir
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, cradleTempDir = error "tmpDir"
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, cradleCabalFile = Just cabalFile
}
cabalCradle :: FilePath -> MaybeT IO Cradle
cabalCradle wdir = do
cabalFile <- MaybeT $ findCabalFile wdir
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let cabalDir = takeDirectory cabalFile
return Cradle {
cradleCurrentDir = wdir
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, cradleRootDir = cabalDir
, cradleTempDir = error "tmpDir"
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, cradleCabalFile = Just cabalFile
}
sandboxCradle :: FilePath -> MaybeT IO Cradle
sandboxCradle wdir = do
sbDir <- MaybeT $ findCabalSandboxDir wdir
return Cradle {
cradleCurrentDir = wdir
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, cradleRootDir = sbDir
, cradleTempDir = error "tmpDir"
, cradleCabalFile = Nothing
}
plainCradle :: FilePath -> MaybeT IO Cradle
plainCradle wdir = do
return $ Cradle {
cradleCurrentDir = wdir
, cradleRootDir = wdir
, cradleTempDir = error "tmpDir"
, cradleCabalFile = Nothing
}